Letter to the Editor regarding, “The prognostic role of PD-L1 expression for survival in head and neck squamous cell carcinoma: A systematic review and meta-analysis”

Oral Oncology ◽  
2019 ◽  
Vol 90 ◽  
pp. 139-140 ◽  
Author(s):  
Rama Jayaraj ◽  
Chellan Kumarasamy ◽  
Suja Samiappan ◽  
Priya Swaminathan
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